/** Portable TTRPG system / character contract (builder + player + future mobile). */

export const SYSTEM_FORMAT = 'ttrpg-system' as const;
export const CHARACTER_FORMAT = 'ttrpg-character' as const;
export const FORMAT_VERSION = 1 as const;

export type ScaleKind = 'numeric' | 'dice' | 'percent' | 'rank' | 'pool' | 'boolean';

export type AttributeDefinition = {
  key: string;
  label: string;
  scale: ScaleKind;
  min?: number;
  max?: number;
  default?: number | string | boolean;
  category?: 'physical' | 'mental' | 'social' | 'other';
  costPerPoint?: number;
};

export type SkillDefinition = {
  key: string;
  label: string;
  linkedAttribute?: string;
  scale: ScaleKind;
  min?: number;
  max?: number;
  default?: number | string | boolean;
};

export type ResourceDefinition = {
  key: string;
  label: string;
  min?: number;
  max?: number | string;
  default?: number;
  track?: boolean;
};

export type TraitDefinition = {
  key: string;
  label: string;
  description?: string;
  tags?: string[];
  prerequisites?: string[];
};

export type DerivedDefinition = {
  key: string;
  label: string;
  formula: string;
  dependsOn: string[];
  round?: 'floor' | 'ceil' | 'round' | 'none';
};

export type ProgressionNode = {
  id: string;
  label: string;
  kind: 'career' | 'feat' | 'talent' | 'other';
  traitKey?: string;
  position?: { x: number; y: number };
};

export type ProgressionEdge = {
  id: string;
  source: string;
  target: string;
  kind?: 'prerequisite' | 'exit' | 'unlock';
};

export type ProgressionDefinition = {
  label?: string;
  graph: {
    nodes: ProgressionNode[];
    edges: ProgressionEdge[];
  };
};

export type CreationStrategy =
  | 'point_buy'
  | 'roll'
  | 'array'
  | 'priority'
  | 'life_path'
  | 'funnel';

export type CreationRule = {
  id: string;
  type: CreationStrategy;
  appliesTo: 'attribute' | 'skill' | 'any';
  params: Record<string, unknown>;
};

export type WidgetType =
  | 'text'
  | 'number'
  | 'modBadge'
  | 'skillRow'
  | 'skillList'
  | 'resourceBar'
  | 'checkbox'
  | 'tagList'
  | 'section'
  | 'portrait'
  | 'notes'
  | 'table'
  | 'repeatingTable'
  | 'statBlock'
  | 'dots'
  | 'percent'
  | 'rankEnum'
  | 'track'
  | 'clock'
  | 'slotMatrix'
  | 'diceStep'
  | 'locationBar'
  | 'spellCards'
  | 'unknownWidget';

export type WidgetFrame = { x: number; y: number; w: number; h: number };

export type SheetWidget = {
  id: string;
  type: WidgetType;
  bind?: string;
  frame: WidgetFrame;
  responsive?: { sm?: Partial<WidgetFrame> & { hide?: boolean; stack?: boolean } };
  props?: Record<string, unknown>;
};

export type SheetPage = {
  id: string;
  label: string;
  widgets: SheetWidget[];
};

export type SheetLayout = {
  pageSize: 'letter' | 'a4' | 'fluid' | { w: number; h: number };
  grid: { size: number; columns?: number };
  pages: SheetPage[];
};

export type CompendiumSpell = {
  id: string;
  name: string;
  level: number;
  school?: string;
  source?: string;
  classes?: string[];
  castingTime?: string;
  range?: string;
  components?: string;
  duration?: string;
  description?: string;
  tags?: string[];
};

export type SystemBricks = {
  attributes?: AttributeDefinition[];
  skills?: SkillDefinition[];
  resources?: ResourceDefinition[];
  traits?: TraitDefinition[];
  derived?: DerivedDefinition[];
  progression?: ProgressionDefinition;
  constraints?: Record<string, unknown>[];
};

export type SystemDefinition = {
  format: typeof SYSTEM_FORMAT;
  formatVersion: typeof FORMAT_VERSION;
  id: string;
  name: string;
  description?: string;
  edition?: string;
  schemaVersion: number;
  revision: number;
  bricks: SystemBricks;
  creationRules: CreationRule[];
  sheetLayout: SheetLayout;
  compendium?: {
    spells?: CompendiumSpell[];
  };
  theme?: { tokenOverrides?: Record<string, string> };
};

export type CharacterValues = {
  meta?: Record<string, unknown>;
  attributes?: Record<string, number | string | boolean>;
  skills?: Record<string, number | string | boolean>;
  resources?: Record<string, number>;
  traits?: string[];
  ownedTraitIds?: string[];
  spells?: Array<{ id: string; prepared?: boolean; notes?: string }>;
  inventory?: Array<Record<string, unknown>>;
  derived?: Record<string, number>;
  [key: string]: unknown;
};

export type CharacterSheet = {
  format: typeof CHARACTER_FORMAT;
  formatVersion: typeof FORMAT_VERSION;
  id: string;
  name: string;
  systemId: string;
  schemaVersion: number;
  revisionAtCreate: number;
  values: CharacterValues;
  creation?: {
    strategy?: CreationStrategy;
    seed?: number;
    rolls?: unknown;
  };
};

export type ValidationIssue = {
  path: string;
  message: string;
  code: string;
};

export type ValidationResult = {
  ok: boolean;
  errors: ValidationIssue[];
};